<!-- 编辑工具栏 -->
<div class="im-toolbar">
  <div class="btn btn-default btn-sm upload-btn">
    <form method="post">
      <input name="key" hidden>
      <input name="policy" hidden>
      <input name="OSSAccessKeyId" hidden>
      <input name="success_action_status" hidden>
      <input name="signature" hidden>
      <input type="file" class="upload-file" name="file" accept="image/gif,image/jpg,image/jpeg,image/png,image/bmp">
    </form>
  </div>
</div>
